[time-nuts] GPSDO diurnal variation
docdailey at gmail.com
Wed Aug 1 00:27:58 UTC 2012
Does anyone have plots of true frequency variation of their 10 MHz standards over days? I am trying to see if what I am seeing is typical or if I need to get a better antenna/gpsdo tuning/temp control. Right now I am on vacation so am capturing data under much warmer than normal temps (ac turned down) and am seeing 250 uHz deviation with a period of about 24 hours (2.5x10-11). I am trying to look at this in a way that is more intuitive and concrete to me than Allan deviation. I am using a precision oscillator as the comparator and am removing linear drift (stochastic) in excel. It seems surprisingly high.
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